FMX compiled units are installed under specific sub-folder which is not added to Library path automatically. So you just need to add this sub-folder to your project's library settings. Android units are installed under "Android" sub-folder.

I'm not sure how Android compiler produces .o files but I can see F:\Auxilary reference in siConsts.o file. Actually "F:\Auxilary" is a path on our build station so may be the compiler uses some paths in .o file. But this is quite strange.
BUT as you have Full Source Edition you can easily re-build your project using TsiLang sources and produce compiled project on your side. Just be sure to define FMX in your Android project that uses TsiLang and add path to sources to project's options.
Please let me know if this helped.